Hybrid Access Network (Bonding Two Accesses)
N. Leymann, C. Heidemann ( Deutsche Telekom AG)
M. Wesserman (Painless Security)
Li Xue, Dacheng Zhang (Huawei)
IETF90, Toronto
IETF #90
draft-lhwxz-hybrid-access-network-architecture
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Why Hybrid Access Network is needed?
Boarder bandwidth requirement while leveraging the existing
network
Flexible way of network deployment with decoupling the life cycle for
fixed and 3GPP access
• Boarder bandwidth requirement in fixed data traffic challenges xDSL supply
• xDSL is difficult to upgrade and rebuild, especially in certain places
Enhanced network reliability
Guaranteed Service continuity
Easy way to launch
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Use Cases
Bonding different access technologies (e.g. LTE and DSL)
together for the residential customers in order to get a higher
bandwidth.
The use cases of hybrid access network
Bandwidth on Demand
There are one or more access lines for residential users.
If the DSL line is fully occupied, bandwidth of wireless access can be added on
demand.
Seamless Handover
If one access line fails, the service can still be provided without interruption.
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An Example of Hybrid Access Network Architecture
Residential Gateway STB-2
eNodeB EPC
Hybrid Access Gateway
TV-
1
BNG DSLAM
STB-
1
TV-2
LTE WAN
MBH
Aggregation Internet
DSL WAN
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Traffic Distribution
Flow A
Internet
Fixed
RG Host
LTE
Hybrid Access Gateway
Packet-Based Distribution
Hybrid Access Gateway
Flow A
Fixed
RG Host
LTE
Flow B
Flow-Based Distribution
Internet
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Traffic Distribution cont’
Hybrid Access Gateway
Flow A
Fixed
RG Host
LTE
Flow B
Backward Capabilities
Internet
Existing Services without bonding
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What IETF Work is needed
• Mechanism to communicate traffic distribution policy to the RG and Hybrid Access GW – Distributed solution: control plane between RG and Hybrid Access GW
– Centralized solution: centralized control plane
• Traffic distribution across multiple connections – How traffic distribution can be enforced on the RG and Hybrid Access GW
based on the metrics (capacity, state, etc.) retrieval
– Backward Capabilities: impact on the existing fixed service, for example IPTV, VoIP
• Ability to monitor E2E state of the access connections – The impact of difference of latency and MTU of two paths
• Others
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Solutions
• MLPPP (No) – Layer 2 technologies
• MPTCP (No) – Application layer – Multihomed hosts rather than multihoming RG – Lack the mechanism on packet-based traffic – TCP application only
• Control Plane between RG and Hybrid Access Gateway (GRE encapsulation control packet) • http://tools.ietf.org/html/draft-lhwxz-gre-notifications-hybrid-access-00 • Tunnel Management and Bond • Policy Negotiation • Traffic Overflow
• Others
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Why Homenet
• In the scope
– RG multihoming
– Protocol for RG
• Out of the scope
– Negotiation between RG and network side
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Feedback
• Any comment and suggestion from Homenet WG is appreciated.
• What is suggestion for the next step?
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BBF Activity
• Hybrid Access for Broadband Networks Work Text project was approved in June 2014 Q2 BBF meeting – 2014.546
RG
3GPP
Fixed
IP Network
Hybrid Access
Gateway Function
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Thank you
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